Orange County-Poughkeepsie Limited Partnership (Narrative) (Details) - USD ($)		6 Months Ended	12 Months Ended
	Apr. 30, 2014	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2012
Option Indexed to Issuer's Equity [Line Items]
Equity interest in O-P		8.108%
Equity method investment, amount the investment account was reduced to		$ 0	$ 0	$ 0
Put Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Proceeds from exercise of stock options	$ 50,000,000
Proceeds on sale of ownership interest	$ 49,800,000